Refactor TS build and fix testing

This change is largely just moving files with minor tweaks to them to fix,
the rest of the commit is build process changes:

- The addons/ and test/ dirs have been moved to src/
- The build directory has been removed
- TypeScript builds are output in out/, this is where tests are run
- The demo now relies on the dist/ build which is performed as part of ./bin/build
- Addons are now shipped under the ./build directory

.gitignore

@@ -1,6 +1,5 @@
 node_modules/
 *.swp
-build/*
 .lock-wscript
 out/
 Makefile.gyp
@@ -12,3 +11,4 @@ docs/
 npm-debug.log
 /.idea/
 .env
+dist/*